Who has taken a Child Development Course before? I need you!

Please reply only if you have taken such a course or understand the topic. 

I need a discussion thread post with three concepts (e.g., temperament, attachment) or research findings (e.g., outcomes associated with bullying) that most surprised you. Begin by briefly explaining the concepts or research findings. Then, for each concept or finding, describe how this new knowledge will help to guide you as a parent or professional. End your post by noting the specific developmental period and topic you found most interesting in this course, and why.

Some resources to go off of: 

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4342335/

http://gladwell.com/do-parents-matter/

Thank you.